Starting on Halloween & ending the next day, the MTA Metro-North Railroad will be performing ultrasonic rail testing between Southeast & Wassaic. Here is more via the press release I received:

MTA Metro-North Railroad today announced that it will perform ultrasonic rail testing on the Upper Harlem Line on Tuesday, October 31, and Wednesday, November 1. Metro-North will put the specialized Sperry Rail car into action on the section of track between Southeast and Wassaic. The railroad uses this high-tech piece of equipment to detect defects and metal fatigue inside the steel rails, inspecting them with ultrasonic and induction test equipment. The Sperry Rail car identifies issues before they become major problems, resulting in a safer, smoother ride and more reliable service.

Elsewhere along the tracks, Metro-North crews will make improvements to the Muddy Brook under-grade bridge north of the Patterson station, as well as cut brush and weld rail joints.

To accommodate Upper Harlem Line maintenance and improvements, from 9:30 a.m. to 5 p.m. on Tuesday, October 31 and Wednesday, November 1, buses will substitute for trains between Southeast and Wassaic on the Harlem Line. Buses will operate 20-40 minutes earlier than scheduled trains.

Service details are below:

Southbound

From 10 a.m. to 4:30 p.m., buses will substitute for trains from Wassaic to Southeast, making all scheduled stops at the following stations: Tenmile River, Dover Plains, Harlem Valley-Wingdale, Pawling and Patterson. Bus service will operate 20 – 40 minutes earlier than normally scheduled train times. Buses will connect with regularly scheduled trains at Southeast for continuing service to Grand Central Terminal.

From 9:30 a.m. to 3:30 p.m., buses will substitute for trains from Southeast to Wassaic, making all scheduled stops at the following stations: Patterson, Pawling, Harlem Valley-Wingdale, Dover Plains, Tenmile River and Wassaic. Customers should allow for later arrival times.